How do I add custom decorate sprites into my map.

I'm currently working on a five-level wad and I'm nearly done with the first part but the issue I'm having is the sprites I'm using aren't really popping up. I tried that copy and paste trick in SLADE but it still haven't went through.

The decorate sprites I'm using is the cacti sprites 

Did you add them to your DECORATE as well?

31 minutes ago, elend said:

Did you add them to your DECORATE as well?

I don't really know what that is but I'll assume that I haven't done that 

Then you might want to read up on this one: https://zdoom.org/wiki/DECORATE

It's either a lump (basically just text) in your .wad file or a separate .txt file in your pk3 folder. This depends on in which format you map. In this Decorate file you have to tell the engine, that you actually want to use the Cacti as a decoration within the game. Don't forget to give it a number, so that you can see it in the Doom Builder as well.

20 hours ago, elend said:

Then you might want to read up on this one: https://zdoom.org/wiki/DECORATE

 

It's either a lump (basically just text) in your .wad file or a separate .txt file in your pk3 folder. This depends on in which format you map. In this Decorate file you have to tell the engine, that you actually want to use the Cacti as a decoration within the game. Don't forget to give it a number, so that you can see it in the Doom Builder as well.

UPDATE: I finally got the cati to work in here. 

Good job! But yes, be careful, with great power, comes great responsibility. :p