How do I remove head liner from 2013 buick regal

I take help from online websites that have this service like helping in repair some like reliable-store have instant help.. others are a bit slow which I don't prefer ... rest is up to u.. U can also get free manuals

Are you talking about the yellow handle for the safety release or the electric latch or the pull-down motor?

have you checked the wiring

talk with a vehicle trimmer as they have experience in head liners and replacement procedures.

If something is wrong with the speed,then the transition needs repair/replacing.Most likely.

The power seat relay needs to be replaced. The seat can not be moved manually unless it is removed from the car and taken apart

Open the trunk. Pull the bottom liner free from the trunk by hand, then remove it fully from the vehicle.Remove seven nuts holding down the fuel pump access cover, using a wrench. Lift the cover up and off the cover studs.

Remove the fuel pump retainer with a pair of inside snap-ring pliers. Carefully lift the pump assembly out of the tank. Use caution when handling the pump assembly, as the float and float arm are delicate and can be easily damaged.

Carefully pry the fuel filter off the pump intake nipple, using a flat screwdriver.
Reverse the disassembly steps to reassemble the fuel filter on your Regal.

hold the release button in while pulling the head rest up,

buy a new tensioner assembley and idler pully and might as well get a new belt while your at it. you will need a 3/8 ratchet a 15 mm socket and a 13 mm socket there is one bolt holding on tensioner remove it discard old tensioner put new tensioner in place and tight bolt. second remove bolt from idler pulley discard old pulley put inton place and tighen bolt. next install belt fallow belt routing digram put head of 3/8 rattachet into hole on tensioner or on bolt head of tensioner pulley depending on style of tensioner and pull or push to create slack in belt push belt into groves on all pulleys and release tensioner