At this point you should have verified that all of the U-Channel lengths and angles are correct. First make sure your tile surface and the U channel are clean and dry. Put a small bead of silicone on the back side of the U channel to add structural strength to the installation and a small amount of silicone on the top of each anchor to seal the screw hole. Place the U channel in position and install the screws. Wipe off any silicone which might squish out from under the U channel. Inspect each screw to make sure it is flush with the bottom of the U channel. In your installation kit there are several different thickness vinyl setting blocks. The glass was reduced in size (1/4") to allow 1/8" for the U-Channel ans 1/8" for the setting block. The different setting blocks allow you to make adjustments to get the panels to stand correctly. You can use the super glue to glue the setting block to the bottom of the Channel.
Wet or Dry Set
If you are not hanging the door off the fixed panel you can do a Dry-Set install. If the fixed panel is going to support another panel or door you need to do a Wet-Set install. This means you will put Silicone in the U-Channel. You need to wait at least a week (7 Days) for the silicone to cure before hanging the door. Don't even test it before you know it is curred.
Dry-Set:
Don't do any silicone work until you have your door and seals installed. Adjust the fixed panels so that the door works as desired. Now you want to put a small bead of silicone on the top edge of the U-Channel where it meets the glass. The smooth the bead of silicone with you finger pushing it into the glass to U-Channel crack. Do this both on the inside and outside of the panels. Evan though you put silicone under the U-Channel when you screwed it down to the tile, you still need to seal the crack between the U-Channel and tile. In screwing the U-Channel down you probably squished it around and sucked in an air bubble. If you get water under the U-Channel it is difficult to get a good seal. Seal the U-Channel to tile crack both on the inside and outside of the unit. Now you want to seal the U-Channel at the door. Get down low so you can see the gap under the glass. Shoot silicone into this gap. Get a ladder so you cab get above the glass looking down at the top of the U-Channel were it is attached to the wall. Shoot silicone into this gap. Give it at least 24 hours before using the shower. Your done.
Note: If your shower will have a header system please read " Installation of Fixed Panel " before you apply silicone to anything.
Wet-Set:
If you are going to hang the door off the fixed panel you need to do a wet-set installation on the fixed panel. Install the U-Channel onto the tile the same way you would do for a Dry-set installation. Put some silicone on the back side of the U-Channel and screw it down to the tile. Wipe off any silicone which squeezes out. Install the setting blocks and test fit your fixed panels so that you know the door width (W) is exactly the same as on the Work Order at the bottom and top of the door. Now the next step is what is different from the Dry-Set. You will put a bead of silicone in the bottom of the U-Channel. You want to put bead proud enough so the the glass panel will squish into it, but not so much that the glass panel is floating in the silicone. If you are thinking the excess will ooze out; it won't and you will have a mess. When you have everything perfect you need to lock it into place. Put some tape on the junction of the glass and U-Channel so that the glass don't move from floor vibration. You should give the silicon a week to cure before you hang the door. If you test the panel and it moves you will need to take everything apart, clean it, and install it again.