Click once in the address line of your browser. The whole url will be highlighted. If not click again, hold down the ctrl key then press the A key, the url will be highlighted then.
Hold down the ctrl key again then press the C key. The url will be copied to memory, aka clip board.
In your post put the cursor where you want the link to go, click once, just in case, then hold down the ctrl key, then press the V key. The url will appear in your post wherever your cursor is.
If this is the first time doing this, it will take forever. After you learn, maybe 2 seconds.
If you're on a phone or tablet, well, can't help 'ya. I don't know either.
. I tried.