Change my wordpress site to do follow links

Hey guys , I do some guest post, they usually want the links to be dofollow but mine are showing up no follow, is there anyway to change this. I also don’t want to have to go through individual post to change it. I’m not very experienced in php functions ect so any super detailed instructions will do. Thanks in advance for all your help.

I see the plug in but it says it hadn’t been updated in 9 yrs. should I even install it?

Sharing dofollow link with sponsered/guest post is against Google Guidelines.