Odd thing is, I answered this question with the html for the link, but tumblr auto erased it. Time for a mini tutorial.

If this isn’t what you are looking for, do a tag search for “tumblr help” and there should be a recent post about adding customized links if your theme supports them.

The html to add the link to your page would look like this:

<a title="Check it out!" target="_blank" 
href="http://with-stardust-and-wanderlust.tumblr.com/tagged/100+facts">
100 Facts Link Text</a>

When it shows up on your blog, it will look like this:

100 Facts Link Text

Code breakdown:

• title - This is the tooltip that will display when the link is hovered
• target - This is the action when the link is clicked. “_blank” opens the page in a new window. “_self” opens the page in the same window. If target is not used, the page will open in a new/same window or new/same tab as set by default for the user’s browser.
• href - This is the URL for the link. If you want your blog link to display all of your posts for this tag, use your blog name (shown). If you want to show all of the posts on tumblr for that tag, you would use tumblr’s url. Using 100 Facts for the href, it would look like this: “http://www.tumblr.com/tagged/100+facts”

I think the rest should be fairly self-explanatory. Make note of the quotation marks, they are important. The key to tags that consist of more than one word is to use plus (+) signs instead of spaces to tie the words together.

I hope it helps. As always, ask if you have questions or need more help. Cheers!