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A bit late, but this table can probably help: You're apparently in the Waiting to run state, which happens with statically linked VIs which are inside VIs which are in Run mode. I didn't remember whether this applies to static VI references, but apparently it does. Another option which hasn't been mentioned here is to store the VI reference in the caller (e.g. using a feedback node) and always start by opening its FP. If that works (no error), you carry on. If it doesn't, you launch a new VI and store its reference.

Terminals are at the edges of nodes. You clicked in the middle of the node. Try again over one of the connection points. :-)

You selected a function not a terminal. What kind of control would you suggest it make? Right click a terminal (one of the inputs or outputs of a subVI) and then create the control/indicator/constant from that and it will make it for that data type. Same with a selected wire.