Hello George,
Yes you can.
You will need to edit the tweets.php file located in the sections folder.
In your Admin Dashboard go to Appearance > Editor and select the Sections folder.
Then select the tweets.php file.
You will see on line 15 the following code;
https://www.dropbox.com/s/5p43nw14551xj5p/tweets.PNG?dl=0
Replace the href tag with your website.
