Step 1)  To Check Instagram accounts with browser in GramDominator  you need to visit: Account--> Accounts Manager 

Step 2) Right Click on "Setting" Under "Action" 

To Check Instagram Accounts you need to click on "Setting" Under "Action". Once clicked a modal window will Popup and Then Click On Check

It will automatically  check your account is working or not and will give the status as success or fail under status. Getting trouble in checking accounts contact support.