Here you go.Feel free to ask for clarification or skip over the parenthesis as those are just hints.
1.Highlight(click and drag your cursor over it) some text.
2.In the bar below it,Insert/Edit Link (it looks like a chain) appears.
3.The first box says "Link URL". Put the URL(in most browsers, it's in the top bar,usually in a box below the tabs) of whatever you want to link to in it.
4.Click "Insert"(the white box with a green border).
necroposting but {c:Save ID|Save name} for saves and for threads jacob1 already said in this topic