This blog will be about editing specific sections/pages, for basic wiki help (like how do I make a link or use those little champion icons) please use my editing cheat sheet.
This guide assumes that you're using source mode editing as it is the most reliable, consistent and hands-on editing mode. To select this method visit Special:Preferences and under the editing tab select "Source Editor" in the Preferred Editor dropdown.
Many examples I will provide use the wiki's revision comparison tool, it may look scary at first but all it does is highlight the changes made between edits. If you have any questions or suggestions please leave a comment below or contact me on my message wall.
Make a custom champion concept
A fellow editor User:Mineko_Charat_Lucky has made a very straightforward template for making a custom champion which can be found at the bottom of User_blog:Mineko_Charat_Lucky/Behold,_a_Sandwich: . After clicking that link and choosing a page name for your concept all you have to do is replace the info that's already there with your own.
Edit the free champion rotation
Template:Current champion rotation is the page that controls the free champion rotation that shows up on the main page of the wiki. When a new rotation is released there are 3 things that need be updated here: the week number, the date and the champions themselves. All of these you can simply replace what is already there with the updated info.
An example of a successful update can be seen here. As you can see, all 3 points I listed before have been updated, even the "nd" to "th" for the date.
Update the last released or upcoming champion
Adding a champion
Once a new champion is teased or put on the PBE they need to be added to the template by adding the champion's name between the <includeonly> and </includeonly> tags: here you can see Rek'sai being added to the template.
Removing a champion
After a champion is released to the live servers there is usually a period of time where there is no upcoming champion and in these times the template needs to be cleared: an example of successfully clearing the template after Rek'sai's release.
Update the big champion image on the front page
There's 2 main parts to the image: the image itself and the text under it, both are tied to the Template:Current_maintenance_data template that I have mentioned elsewhere in this thread and will automatically update when these are changed. If an image for an upcoming champion hasn't been uploaded and you have a bit of photo editing knowledge then you can make one using File:HotTemplate.png (easy to do by making 3 layers, the champion image, the border and the wiki logo in that order) and uploading it with the file name HotX.png where X is the champion's name (like File:HotRek'Sai.png).