There are 2 ways:
1. Create a widget called Copyright and enter your text into that.
2. In the blog admin click Appearance > Editor then choose footer.php
Copy all the text you see and keep that copy (in case you make a mistake)
Carefully add the text you wish
Click Update file.
Note: If you upgrade the theme that change will be lost so using a widget for that theme is probably best.
If I am editing the footer.php, Do I just add it to the text that is already in the file or do I get rid of it all and then add it?
Ok! I think that that worked!
Is there anyway you could tell me how to get rid of the “Landscape theme powered by….” and all that junk?
Your best solution is to create a child theme and a new footer.php file within that. Copy over the code from your main theme into your child theme, then edit the child theme accordingly. If you need more info on child themes, there’s a codex page that will get you started:
http://codex.wordpress.org/Child_Themes
With a child theme, if you update the main theme, your changes will still be there.