By "granting access" to a promo, you are adding it to the respective contacts' Promo Libraries. They access their Promo Library screen when they login to their free Haulix account.

To grant access without sending an email invitation:

Hover over PROMOS on the top of the screen and select MY PROMOS

Select a promo in the left column

Click Ways to Share to expand the options and then click on Grant Access

In the popup window, select one or more groups of contacts you want to grant instant access to and click Save.
As long as your promo is live and not expired or deleted, the next time any of those contacts login to their Haulix account, they will see your promo in their Library sorted next to any of your other promos you have granted them access to.