3ds Max, trying to get a good ''skin'' placement

[Taurus]

Yo guys, I got a little problem. I can't seem to get this right. When I try to use ''Editable Mesh, Polygon, Create'' feature. I can't get a good ''skin'' placement on the surface. It's all washed out, which means the surface is small. But is there a way around this so it will match up with the other wall? (btw I made the other wall by just changing the surface ''skin''). I'm new to 3ds max, so pls don't me harsh. 1: my problem: 2: what the skin is, 3: what it should look like. https://imgur.com/a/quNyv78 . If anyone could help me, I'd appriciate it alot, because I could not find it on google myself. Mabye im just too stupid. Anyway thanks alot.

Greetings Taurus

[Taurus]

First of all smd, but there you go I found the answer: https://knowledge.autodesk.com/support/3ds-max/getting-started/caas/CloudHelp/cloudhelp/2015/ENU/3DSMax-Tutorial/files/GUID-5BA72891-97EC-4688-8B50-9FACCF1FF040-htm.html