If you hold your finger down on the screen over the words/link, you should get a little pop-up with one of the words being select. Press on select and a portion of the link - or maybe all of it, it really depends - will be highlighted in light blue with a darker blue dot in the upper LH side and another in the lower RH side.
Press on and hold either of those two darker dots to get the light blue area over the words/link you want to copy. When you've got everything highlighted, the pop-up should appear, this time with an option to copy. You select copy and then it's on the clipboard for pasting elsewhere.
Hope that helps.
Marilyn