Please note that in order to complete your recordings using recordpad you are required to use the microphone on your pc and start the recording on the recordpad software.
Regarding your tascam please take a look on how to move your files from the device to your computer.
Connect the Tascam to a computer using the USB cable. Use the – button to select 'Storage' and press enter (>😉. The computer will recognise the Tascam just like a digital camera or memory stick. The sound files are in the Music folder and you can either copy and paste or drag and drop them onto the computer.