Click the contracts directory in the default_workspace
Open the 3_Ballot.sol file and delete all of the code within it.
Click the icon "S" icon in the left sidebar and then change the COMPILER version to 0.4.17+commit.bdeb9e52 to match the lecture videos.
Find the COMPILER CONFIGURATION section and tick the Auto compile box. With this option enabled, Remix will compile the contract automatically.

You should now be all caught to begin writing your contract code as shown in the lecture video.
Note - If you exit Remix in your browser you may need to perform these steps over again. Also, if you use the file browser to switch between files in the editor it may default the compiler back to the latest version.