Steps to be Followed for Token Expired Error

How can I close my account?
How can I send the documents which are required to be signed by the parents through Snap homework.? 
How do I send homework? 
Can I change my password or edit my profile?
How Do I Add a New Class to my account? 
How do I improve the quality of images sent to parents from my device?
How can I add another account to an already existing App on my device? 
How I can switch from a teacher account to a Parent account? 
I have an iPhone. Will Snaphomework work on my phone?
I have an Android Phone. Will Snaphomework work on my phone?

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