Login and registration link

Good day,
I hope all is well on your side of the world.

Please could I have guidance with the below:

1. I would like to link a button on my site to the login/register popup. e.g. a user on the front end page clicks on a button that says sign up. When they click on the button your pop-up comes up. How do I go about doing this? Is there a url for this pop-up?

2. The Footer- I am unable to edit the footer. It still has Funding Press logo and “from the blog” feature. I have gone to the back end- Funding press-Footer. It gives me the option to change the background but nothing else.

3. the “submit a project” page. If i wanted to change the wording (just the wording) of e.g. “Project Title” to “Proposal Title.” Is there a specific line item in the CSS coding I can go to to change this?

Thanks!