These are user to user forums so not a contact for any Magix staff and no-one here can extend your trial period, sorry.
To extend your trial you need to obtain a (temporary) serial code from Magix; you would normally see an on-screen message within the program inviting you to do this, I think every time you attempt to open the program. If you do not see this message you should email infoservice@magix.net and ask them for help with this. You will need to give full details of exactly which product and version you have and the date you downloaded and installed it.