Keith shannon shows how to install under pad on concrete before the carpet installation.
Utube how install carpet padding on concrert.
Place carpet gripper strip parallel with the wall and leave a inch space between the strip and the wall.
Just be prepared to take your time and make sure you have the right tools which you can rent.
Lay the padding on the floor pull it up to the grippers and staple it to the gripper strip.
Then lay tack strips around the perimeter of the room and install your strips of padding.
How to install carpet on a concrete floor.
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Step 4 lay out the padding.
Before you install the carpet make sure to check the concrete for any moisture issues that need to be addressed.
Step 3 install carpet grippers.