To post a link in the forum (to save you typing the URL), go to the website so the URL appears in the 'Address' panel. Click on the URL so it turns blue, then ctrl/c to copy. Then paste into the response box.
If it is a long address that extends out of the box, click in the middle and use the left arrow until you see 'http'. Click just to the left of 'h' so it all turns blue, then copy as above.
If it looks as though it may not post as it is, try by closing the web window, paste into the address bar, and see if it takes you to the right place.
If not, paste into click here Note that the 'tiny URL' will automatically be copied ready for pasting.
Microsoft Knowledge Base links need special attention, see VoGs click here
Some online stores won't link to a product, Maplins is an example.