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Hello [name]! Thanks for joining the GMC. Before making any posts in the Tech Support forum, can we suggest you read the forum rules? These are simple guidelines that we ask you to follow so that you can get the best help possible for your issue.
You need the Mobile license. What you can do right now though, learn GMS using your desktop license, and buy the Mobile version when you feel comfortable spending the extra money. It's just enabling the new target platform in the same GMS IDE (no additional installation of a separate development tool), and your projects can be exported to the new mobile platform when you get the license (whether it has a pleasant mobile experience after only doing desktop development is another matter, that comes down to planning and understanding target differences, etc.)