Normally, the "login to view prices" string (or whichever custom string you are using) is simply a text string.
If you would like to make this into a link ( for example to send users to the "My Account" page for login / registration ), you can do this by following these steps:
- Step 1) Go to B2BKing-> Settings-> Language and Text
- Step 2) In the "Hide Prices to Guests" text field, enter the following:
<a href="https://yourcustomlink.com">Login to view prices</a>
It should look like this:

- Step 3) Save Settings and you're done!