First, we suggest you always work in a quiet environment and preferably use headphones.
The recording problem you are experiencing is either related to the browser you are using to access the platform (we suggest you use Google Chrome), or permissions for the microphone have not been allowed.
We suggest you consult the Google Chrome help centre at the following address:
It will give you all the information you need for enabling your microphone on our site.
Alternatively, you can manage your microphone permissions by clicking on the small padlock at the top left of the address bar. This will take you directly to the settings so you can authorise the various options.