All I want to do is adjust the tempo

I'm an experienced copyist and arranger and I've used other notation packages but am new to Notion 4 which I've bought mainly for sketching out ideas. I've started writing out a piece to test it out and to be honest I'm finding it painfully slow going to get to grips with, it's very unintuitive. But as the early period of using these things is the hardest I'll persevere for a while and see if any advantages reveal themselves.
Anyway, myy question.
The test piece is showing a tempo of 90, I didn't set that tempo and it is presumably a default with the score template I chose. All I want to do is adjust the tempo. The tempo numbers in NTempo view seem unadjustable. The in-play method in the user guide (tapping keys or moving the arrows) work in play but then reverts to 90 at bar 1, which is annoying. I just want to quickly change the tempo for the whole piece and leave it at that. I've been right through the user guide and did a search in there on the word 'tempo' - nothing.
Can anybody help? Thanks in advance.
Anyway, myy question.
The test piece is showing a tempo of 90, I didn't set that tempo and it is presumably a default with the score template I chose. All I want to do is adjust the tempo. The tempo numbers in NTempo view seem unadjustable. The in-play method in the user guide (tapping keys or moving the arrows) work in play but then reverts to 90 at bar 1, which is annoying. I just want to quickly change the tempo for the whole piece and leave it at that. I've been right through the user guide and did a search in there on the word 'tempo' - nothing.
Can anybody help? Thanks in advance.