The title says it all...Do I need to add any perms to the default role?
It says "You Don't Have Permission To Use XYZ"

look at build permission from: https://essinfo.xeya.me/permissions.html

Or you can just delete essentialsXAntiBuild if you just intend to let all players build.

Basically what benwoo1110 said. Please fill out the template next time, very important for figuring out your problem. Configuration helps with this too.