I am not entirely sure what issue you are having, if you are wondering how to access the studio - you can find the "Studio" button in the navigation bar.
if your wondering on how to make a new project or track, You need to go to the main page and click the APP button. depending on your electronic device, the way you do things is different. Phones, and Tablets cannot run the Audiotool App, while a computer (a moderately good running one is recommended) will work just fine. if you have more questions, i'm here to help.
For those wondering, you need to click the studio button at the top with the orange soundwave like symbol. After it loads, press new project.