Visit an online musical instrument/equipment sales website or a retail music store to price and purchase Studiofoam acoustic panels. Purchase as many panels as you need to cover the desired area. If you do not have a closet big enough to use as a vocal booth, it is possible to section off a portion of the room to use as a vocal booth. Get creative by hanging blankets or using or even building partitions if you'd rather not have the room professionally redesigned.
Open the caulk-style tube of Tubetak studio-foam adhesive. Cut the tip of the tube off at an angle for greater control of the adhesive.
Adhere the Studiofoam panels to the walls in your vocal booth by applying Tubetak to the backs of the panels using a caulk gun, and sticking the panels to the walls. TubeTak is a permanent adhesive. Once the panels are mounted, they will not be able to be removed without damaging the paint or finish of your walls.
Cover as much of the vocal booth wall area as possible. Pay special attention to the wall directly in front of the microphone.