When you click on the icon to respond to or create a new thread, the small editor box you type in pops up. Look at the row of tools just above the editor box. Just to the right of center is a blue globe of the world with a chain link below it. A mouse over brings up the alternate text, "Insert Link". A click on that icon will bring up a small box asking for your URL's link. If you do a click and drag on specific text in the editor so that it turns blue
before you click on the Insert Link icon, you can Ctrl-V or paste the URL to be associated with the blued text, i.e.
SKU: 1217. Otherwise the entire hyperlink will be pasted into the document. Depending on how long it is, it can scroll off the page.
Also copying from the browser's URL bar and pasting into the box is much easier with less chance of an error than typing it manually.
BTW, as long as you are using the ShiningBeam regulator, you'd be much better off with the "I" voltage bin P7. The "J" bins are better for direct drive with less chance of frying the LED. But the "I" bin with a regulator is safer and will stay in regulation longer as the 18650 drains.