Go to your hub and select edit. Go to the text capsule where you want to place the link and click edit.
Choose which text you want to be the link or whether you want the URL of the site to be the link.
Highlight the words or the url you have chosen in your text, go up to the little chain symbol in the top of the editing window and click on it.
A box will open in which you can type in -or paste in the url of the website or webpage you want to link to.
If you want the link to open in a new window, so that the visitor does not navigate away from your page to look at the link you have provided, click on the blue text which says 'show advanced options'
and select the 'open link in new window' option.
I hope this answers your question, if not, please contact me and I will do my best to help.