The Next Button Disappeared
There are a few explanations for this:
1. Some questions require that you select your answer, click "Check", and only then do you have the option to move on to the Next question
2. Some questions show you multiple choice options with a blue speaker to play the audio for each one. Playing the audio does not select that option, though. To select that option as your answer, make sure to click on the sentence itself.
3. On mobile, sometimes you have to scroll down a bit to see the Next button because certain question types take up more room on the screen
If none of those suggestions help, we would recommend checking out this guide to resolving technical issues with some of the most common solutions: https://help.practiceportuguese.com/article/13-quickly-resolve-a-technical-issue
If you need individual support, please feel free to reach out and we will be more than happy to help. We just like to offer these suggestions first as it could help you get back to learning more quickly and easily.