Sorry mate I probably didn't explain it very well...or not at all!!
If you are using a computer/laptop when you go to make a post on the forum you will see a row of little squares (icons) just below where you type the subject of your post.
On the 5th group of squares along (or the 17th square along) you will see it has a little picture of a chain link in it. If you click on it a menu will drop down with 2 blank rows. In the top blank row you paste in the weblink (http://www.natski.com) of the website you are trying to link to and in the bottom blank row below that (the chain link with the blue letter A) you just type whatever text you want the link to show instead of the full www.natski.com
If you are using a mobile phone only to post on the forum then I haven't a feckin' clue how to do it with just a phone!