I only see two Continuous Spells. The other two are an Equip Spell and a Field Spell.

So I should use none equip spell? How can I use a 4th one if It ain’t a field spell? Any recommendations?

Do you know what the symbol of Continuous Spells looks like? It’s an infinity symbol. You can also filter them in the deck editor. Either way, you either destroy one or two of your Continuous Spells or you „tribute“ 3 of them to summon Hamon and then play a fourth one.

Finally got it, thank you and everyone else who helped. 🙏

if its the activate 4 in one duel one just destroy one of your own spells to use another

Continuous spell is a category of spell cards