How do you post a picture in these

Upload a picture to Imgur in this link.

https://imgur.com/

After uploading has finished, all you have to do is copy paste the link on the comment section itself.

There are multiple ways, if it is a picture you first have to upload, then follow the instructions BeatzBoyFTW has given, if it is a picture on the internet then you can simply put [img] at the end of the link and it will automatically display it as a picture and not a link (if the link directly leads to the picture then you don't even need to put the img at the end)

Hi!

You can find all sorts of info on the Boards and how to use them here:

https://boards.na.leagueoflegends.com/en/c/community-moderation/atIUBQPe-boards-users-guide

Specifically for pictures, the info can be found under the formatting section:

https://boards.na.leagueoflegends.com/en/c/community-moderation/64ypaBVX-boards-usage-part-1-formatting