Your question is so broad it is almost impossible to answer! You need to tell us a lot more about your computer, about the mic you intend to use (especially about how it is to be connected to your computer), whether you have an external audio interface (and if so, which one), how you intend to monitor the signal, etc., etc.
There is a manual. I suggest that you download and read it.
There are tutorials on the Magix.com site.
The second one in this link is called "Audio recording." Before recording, click on the parameters button beside the red record button to make sure that you have the correct mic selected and that the other parameters are what you want.
Thanks for that extra detail, but please also give us ALL the information requested in my previous post.
I assume the mic you have is this one? Is that correct? If so, it really is NOT suitable for recording vocals, in my opinion. It is a mic designed for conferencing and hence is "omnidirectional". I note there is also no mention in the specifications on that Amazon page of any expected Frequency Range; that alone would make me very sceptical about it!
Bottom line: if you want to make a recording of your voice that is even "half-decent" quality, this is NOT the mic to achieve it!
I have read through the tutorials and it appears that my setup is much more complicated then what your tutorials are explaining. Nothing seems to be consistent and I am completely lost. One minute I can record using my snowball mic and one minute I can't and playback of the recording is even more complicated.
You have posted to a thread asking about how to record vocals with a question/statement that is much broader in scope! Please do not do this, but rather start a new thread with your question, making sure to include FULL details of your computer and set-up (this post will show you the sort of detail we really do need in order to have any chance of being able to help you). Also, please tell us the exact version and variant (Basic, Plus or Premium) of MM you have. You can find the exact build number of MM you are using by going to Help>About.