I'm sorry you're having this issue. We recently launched an update that resolved issues users were having logging-in on mobile, so I want to make sure it works for you, too.
Can you please let me know what device and browser you are using? Also, does the Log-In option that should show on the left drop-down menu not appear for you at all?
Re: Can't log in on mobile
Hi @KnotHolly,
It looks like it's working now. I have a Motorola Droid Maxx that's on an Android platform, and I'm seeing the left-side menu now. Thanks!