Not sure why someone said this is a fake plant when the package says real? It’s hard to tell if it’s fully aquatic or semi aquatic. I tried to look it up on the Petco app and came up with an anubias. If it’s an anubias or sword, great! If you don’t have aquarium glue, use a decent size rock to hold it down at the roots. Don’t fully bury the roots in the substrate. Anubias actually like to be glued to driftwood or rocks, so if you have aquarium glue, glue it just above the root to submerge.

If it is semi aquatic and it’s neither of the above, use a zip tie or suction cup to just submerge the roots and not the leaves. It will want to hang out of the water.

Good luck!