Loosen the cassette bolts and either raise or lower everything. The only adjustment is all the way up or all the way down.
On the front, move the spacers above or below the spindle to change ride height.
What are you scrapping? Low rear ride height is the preferred setup on CRGs. If it’s the seat, move it up.
Search for Arrow’s setup guide, I think it does the best of explaining the how’s and why’s of ride height adjustment.