To add a link to a button, click on the button. When you have selected the button, you will see a “Link” field in the left upper side of the editor where you can type the link URL.

This is how you can do it in the Chamaileon editor:
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It is also possible to add a title to a button:

If you are not using Chamaileon yet, you can register here for free and add a link to a button easily.

Naturally, you can use merge tags in the button link to sync custom personalization as for any text in Chamaileon. To use merge tags in general, check this article.