Im thinking it happens (first) from focusing intent on a certain location. then through visualisation and intent intend to be there. I dont think there is a need to intend into teleporting there as the intent of being there should be enough.
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they site I was looking at went out. sus. but I found this pannel about it.
The way they describe instant transmission is like this.
using spirit control:::
Spirit Control allows its user to achieve a multitude of potent abilities through their ki, including Instant Transmission (a basic ability), Cloning, Gigantification, Healing (an advanced ability) and Forced Spirit Fission (an extremely advanced ability). These abilities achieved through Spirit Control are used by shifting, splitting and growing the user's spirit. Achieving good Spirit Control allows the user to sense ki from a much greater distance and utilize their energy to attack much more efficiently, though at first this newfound ability to use their ki properly causes the power to be somewhat uncontrollable; this was demonstrated by Vegeta, who tried to use a simple finger beam but ended up firing off a powerful energy wave.
they do this::
by concentrating on a particular individual's ki signature, and transmitting or feeling that being's location. The user can rematerialise anywhere within a short range of their target.
In the movies ( which are not cannon which means they are not made by the original creator of dbz but instead the animation studio), the process is further elaborated on as entering a Teleportation Zone to transmit, where a user uses the zone as a waypoint to lock onto the desired ki signature and exit at that destination. Goku describes it as more complicated than traditional teleportation, as it consists of merging one's energy and demolecularizing their atoms in order to enter and transport oneself through the Teleportation Zone to begin with, then reassembling in the area where the locked-on signature resides.
You can do so with your merkaba I've gone to different places just not in the physical yet. Still working on it but I'm guessing it has to do with your hands tho and complex