I want to make a condition where the letter H has to be pressed before the spawn actor can be active
so to clarify your looking for the begin overlap event to not be able to trigger until you press the h key? or do you want to overlap, then not spawn until the h key is pressed?
i would suggest looking into the gate node.
another solution would be to use a Boolean variable and a branch. for example on begin overlap set the bool to true. then off of the h input have a branch that checks is the variable is set to true.
not being able to be triggered till the H key is pressed