Thank you for reaching out and using SoundBridge.
To cut the white space in your audio, select the Cut tool on the transport bar or hit X on your keyboard.
Then use the tool to split your audio block where you need to.
After splitting the audio block, select the selector tool on the transport bar or hit Q on your keyboard.
Use the sector tool to select the part o your audio you want to remove, then delete it by hitting delete on your keyboard.
The SoundBridge team.