So I made a structure and saved it as a schematic but I don't know how to use saved schematics, can someone help me?

im having the same issue. super frustrating. if i ever figure it out ill be sure to come back here

The schematic feature appears to be for Create mod integration. Get yourself a schematic table and a schematic + quill item and you can make a create mod schematic for use in the Schematicannon. You can also use the schematic item to place the build in the world, if you are in creative mode.

https://create.fandom.com/wiki/Schematicannon
https://create.fandom.com/wiki/Schematic_And_Quill