I'm getting the feeling you're new at this
That's ok, it's easier to ask questions than deal with an unexpected problem because you didn't ask.
Best to have the parking brake applied while you do this, I usually leave the engine running if I have to adjust the lift arm height upwards.
Remove any hydraulic quick connections, it's always the first thing you remove and the last thing you connect.
I try to put some 2x6 under each end of the blade and park it in a level area. Lower the blade onto the planks, and adjust the position control until you can easily slide the top link pin out (no tension up or down). Then place a block under the front of the blade frame to hold it parallel to the ground at close to this height. Lower the frame onto the blocking, remove the lynch pins and slide the arms off, then drive away.
If you have trouble re-connecting the blade, you can adjust the lower lift arm on the right side for height via the turnbuckle. Re-set the height adjustment to level the blade once you have it attached. I usually just muscle or pry the blade into place if the height isn't perfect, it may take a little swearing to get it right. A crowbar can be your best friend.
Sean