How do i edit thread or topics on mobile?

Title says it all. I don’t have an option for doing that, that i could see.

Do you have that pencil icon? You can edit them with that.
Reminder Just in case : you can only edit thread created by yourself.
Have fun!

I do not have it.

Perhaps i do not have the permission to do so, is there anything necessary in order to get that feature?

Sorry I’m not quite sure.
Maybe @Josh can offer some help.