Word automatically turns a web address into a link when you press Spacebar or Enter, if you typed "http://" at the beginning.

If you want to link from "friendly text" in your document, the fastest way is to start by copying the address to the clipboard:

  1. Copy the address from your browser's address bar.

  2. Go to your document in Word, and select the text that you want to be the link.

  3. Press Ctrl+K

  4. Paste the address and press Enter.

  5. Later, if you want to change the link, right-click it and choose Edit Hyperlink.

    Edit a hyperlink

Source: Microsoft