I wanted to follow more mixers but I can’t seem to figure out how to do it on my mobile
That’s probably because you clicked on the user name on the forum side…(as you can clearly see in your screenshot).
Implies that you have to be on the recipe side of ELR.
Once you’ve clicked on the recipe creator’s name, you’ll be taken to their page which will have a link that’s labeled to the effect of “start following”. Click that.