Jero, you need to edit that byte in the 0x90624C1B resource to represent the number of planes you have. So if you have one plane, it will be 01, for two planes 02 and so on. Remember that this is Hexadecimal (base 16) though, so if you have 10 planes it will be 0A, 11 will be 0B and so on.
In this image (where I have imported the resources to a new file in S3Pe) you can see the relevant byte highlighted- in this case I have two water planes (two 0x707CA200 resources) so it is set to 02:
To change that I would just open up the 0x90624C1B resource in my hex editor and change that byte, then save.