Select a note or rest in the score where you want the tempo marking to be located and then click on a tempo marking in the tempo pallet. You can edit the tempo marking to reflect the tempo you want. See https://handbook.musescore.org/text/tempo-markings
Comments
Select a note or rest in the score where you want the tempo marking to be located and then click on a tempo marking in the tempo pallet. You can edit the tempo marking to reflect the tempo you want. See https://handbook.musescore.org/text/tempo-markings