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TrollStore is not a jailbreak.
TrollStore is a tool which uses a codesign bypass as well as another exploit in order to permanently sign any app with any entitlements which are necessary for the apps functioning.
Installing TrollStore is a process which varies depending on what device and iOS you are running, as a result, different guides are attached below depending on said combination
If you have an A12 or newer device on iOS 14.0 to 14.8.1, as well as any device on iOS 15.0 to 15.5b4 or 15.6b1 to 15.6b5, follow Installing TrollStore (TrollHelper OTA)
If you are jailbroken on iOS 14.0 to 14.8.1, follow Installing TrollStore (TrollHelper)
If your device is on iOS 13.7 and older, is running iOS 15.5, or is running iOS 15.6 or newer, it will never be supported by TrollStore.