If you have a cat, then go to it's litter box. Dig through all the turd & sand until you reach the "bottom", you should see a wormhole with swirly blue and red energy coming from it. Just say a date, and jump in.
If you don't, you can just wait 100000 years before time travel is possible.
well I'm here actually because I was sent on a historical research project . . . I'm originally a iron age person and i was supposed to go to the bronze age. Accidentally used the AD or BC dial, it was in alpha but uhh here i am