you go to the page and look for the URL at the top of the page. http://www.(whatever
You place your curser on either end and hold down the left click button and run the curse across it until it is entirely blue...OR double click and it should all turn blue.
Then release the button on your mouse and the URL should still be blue.
Then right click your mouse (while it is hovering over the blue url) and you will see and option to "copy" scroll down to it and release the mouse button when you are over the word "copy", it will now be saved. You can do this same thing by going to "Edit" at the top of the page and clicking on edit and choosing "Copy".
Then you go to wherever you want to paste the URL (or whatever) and right click and choose Paste...OR go to Edit and choose Paste.
BTW, whenever you have an issue like this one, it is easiest to go to google.com and ask. If you go there and type in "how to copy and paste" you will get dozens of responses. You may have to because I
am famous for being wordy and confusing. Good Luck!