Step 1
From your Dashboard, select Communications on the left-hand side, then Contact Lists from the drop-down menu.
Step 2
On the right-hand side click on the 3 dots for the contact list that you want to edit
Step 3
Select the blocks that you want to communicate
Step 4
Use the fields to select the group of people that you want to communicate and press add Block
Step 5
You will notice that the new block was added to your contact list . Then Click on compose message