Where do you want to put it? If you are putting it in the content section of the page, you can use the paperclip icon to insert a link, similar to email programs. Please feel free to ask if you need more clarification. This video tutorial covers adding a link to an image in the header: https://www.ultimatewb.com/video/119/how-to-add-a-link-to-an-inline-image .
You can also choose to put links to other websites on your menu and footer links - on the add/edit page, enter the link in the field:
Redirect URL (top options get priority)
*To link to an outside URL, be sure to use "http://" in the beginning of the URL
Also, choose your Redirect Type:
Redirect Type:
* None = No redirecting.
* Direct = No double page loading required; page acts just as a redirect link.
* Page Reload = This page has its own URL too, and then redirects - i.e, double page loading.