You don´t "board" a wreck, you salvage it (research the salvage module, design a ship with at least one of them, build it, put an officer with a factory bonus in charge and send it off)
You CAN Board enemy ships while they are active. To do so, you need to put troops (usually one or several marine companies) on a ship with some troop transport module and have a dropship (usually a fighter class with a small drop module). Have the ship that holds the troops have some cargo handling systems to speed up the loading of the marines into the dropship.
Send the dropship(s) off to board the enemy ship.
Note: There is a huge penalty for boarding an enemy ship that is still underway. You want to have as much of a speed advantage dropship <-- > target as you can get. Without that, most of your marines will end in two ways, 1. missing the enemy ship and drifting off into deep space or as a red smear on the hull of the enemy.
Hm, so THAT´S how the reaver ships got their paint job.