number of extensions wrong during installation

[Luc Braeckman]

Hi,
I'm relative new to 3CX and now following the basic training.
I installed 3CX on Amazon EC2-micro according to installation manual. I clicked a little to soon, and got now only two digits to build extensions.
I learned from the training that I can't alter this number of digits, so I guess I should reinstall.
Can someone give me some guidance to reinstall on AWS EC2?