If you mean the bolt release, it's on the bottom left side of the receiver, away from the bolt handle. From the rear, insert a small screw driver, or other suitable device, and press down on the release while extracting the bolt. The bolt just slides in to reinstall (it presses the release for you).
Remove the screw that is above the bolt on the receiver. This screw holds the bolt into the receiver and once it is removed the bolt will slide out.
Your rifle is a Marlin 81 made for Sears. Insure the rifle is COMPLETELY unloaded. Open the bolt, release safety,draw bolt to the rear, depress and hold trigger, slide bolt out of receiver.
Pull and hold the trigger, then pull the bolt back and it should release.
Ben Bolt - 1913 was released on: USA: 28 November 1913 USA: 13 February 1914 (re-release)
Bolt - 2009 VG was released on: USA: 18 October 2009
The Lightning Bolt - 1913 was released on: USA: 24 December 1913
A Bolt from the Sky - 1913 was released on: USA: 21 July 1913
A Bolt from the Sky - 1915 was released on: USA: 8 November 1915
Raise the bolt to the unlocked position, then pull the trigger while removing the bolt. That makes no sense. The Model 60 is a semiautomatic firearm, not a bolt-action. The old style Model 60 used the operating handle as a bolt hold-open. Pull the bolt about 3/4 way to the rear and push in on the bolt handle to lock it open. Pull the bolt handle back out and the bolt will be released to run forward. Newer Model 60's have a bolt release lever that extends down through the trigger guard.
Retract the bolt action to it's furthest open position. Pull the trigger which will release the bolt retaining latch, allowing the bolt to be removed from the rifle.
The spare tire release bolt is located in the rear cargo area of the 1998 Toyota Sienna. Look for a small "U" shaped piece of loose carpet on the floor of the cargo area. The bolt should be turned counterclockwise to release the spare tire.