Find the "Inoculate" menu option (at the top of a page).

Every Wnki admin page has a full menu at the top of the screen. We do this so that you can bounce back and forth between functions without having to access a central menu all the time. Find the "Inoculate" menu option (three from left) and click on it

Look in file list for index.html
Let's continue using index.html for our example. In addition to being a simple file to find in the list ;-) it will also give us many options later. Hang in there. You'll see how it all ties together soon.

Click on the radio button to left of index.html
When you click on the radio button it will put a dark spot in the center indicating that index.html is the selected file. This is what we want. If you experiment a little you'll notice that the form will only allow you to select a single file. If you click on a different radio button the previously selected file is unselected. This is because we can only edit one file at a time.

Look for "Make Into Select File" box
The "Select File" part is the top of a selection list. By clicking on the down arrow on the right side of the box you can view and select from a full list of possible Gallery types.

Select Gallery.
The various options listed here represent standard gallery types. You can see examples of these forms on the Here

Click on the "Click to inoculate page" button.
The index.html page is now properly inoculated to be used as a gallery.