Also remember that internet search or googling is your friend in solving issues. A lot of commands are used across all Linux distros. Things like package management are more distro specific.
OMLx uses dnf for package management as does Fedora, RedHat, and CentOS and a few others. How to use dnf.
If you are in doubt you can always ask here or on OpenMandriva Chat. Chat is likely to provide a faster answer but remember folks may not be in your time zone or even close so you do need patience and wait for a response/answer.