No problem!

First you find the site you want to link to. Go up into the address bar and click it. Once you have the site's entire address highlighted, copy it.

Next, you write something down, highlight the words you want to make a link and then click the "Insert Link" button (paperclip thingy with the earth behind it). Paste into the box that pops up the address of the site which you copied earlier. After that you should have some words that link to a new page!

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I am not going to be on this site for about a month (not that it matters much) until I get Spirit Tracks and beat it. (I don't want the plot spoiled, after all.) But I'll be back!