Small problem

Hello, I’m using this plugin for my site and it works and looks nice but I’d like to customize the message that appears above the registration, logout and so on. For example, when I click on register and it brings me the registration page, it says “register for this site” and I want to change it to “Join (my site)”. How can I do that? Thanks

https://ww.wp.xz.cn/plugins/admin-custom-login/