When traveling astrally or shamanically, we can teleport to different locations and times. Limitations still exist; our spirit guides might prohibit us from going places that aren’t in our best interest. It’s their job. Talk to your guides if you experience problems.
Visualize a portal of light in front of you. Program it for a specific destination. Basically, point your thoughts at it and mentally tell it to take you somewhere. Then float or step through.
Since the shamanic plane exists at a higher frequency, sometimes you can speak with your and other people’s spirit selves. Remember to be ethical; don’t ask private information of other people. You can ask your spirit self how he/she feels at a particular time in the past. You can soothe yourself and others, apologize to others for wrongs, and help mend relationships this way. It won’t change the past, but it can help change your own inner feelings and relationships in the present, provided your current behavior also changes.
Example: Joe had a running conflict with Jane over many lifetimes. He spoke his and Jane’s spirit selves at various flashpoints (explaining he was from the future). He worked to understand situations and feelings from Jane’s point of view. When Joe better understood the situations, he apologized to Jane at those moments. Joe also reassured his own spirit self that he (the spirit self) wasn’t a bad person despite the mishaps and traumas, and that placing blame wasn’t important regardless of whose fault it might be. This encouraged emotional healing. Joe’s guides directed him to relevant places and times, then fed him insights of what to say. The process helped him clear centuries of karma and heal relationships. It didn’t completely solve present day problems, but it did lay the groundwork.
This ability is a blessing. It’s the kind of work I can do via Singing Tarot, and I encourage anyone with positive intentions to learn it. Ask your guides for help.
On the flipside, there are instances where people tried to use this maliciously, and their higher selves stripped them of their abilities. Act evolved, or he/she may turn it into a learning opportunity with unpredicted consequences. Intention is everything on the spirit plane. Before starting, evaluate whether you’re doing the right thing for the right reasons, and not to be controlling, etc.