How can I get in touch with a project manager regarding task revisions?

You can connect with your project manager via the comment section on the job card itself. This comment section is labeled ‘Conversation with PM’, and can be used to relay messages directly to the PM. 

The PM will be notified via messages on their dashboard and can resolve the issue by commenting on the same card. The segmentation in the comment section makes it easier to just communicate with the individual person who can resolve your issue promptly.