Hi I accidentally hit finish, how can I get the task back?
the task was:
Install and Configure Tomcat Server
Similar tasks will be assigned back to you again in near future so don’t worry about this one and focus on upcoming tasks. 
Try not to worry about the record, we are all human we make mistakes we learn and we grow, I once accidentally rebooted the wrong server in a real job, accidents happen, they help us gown stronger, and they offer learning opportunities.
I believe you also have to hit “confirm” now too. So there’s a level of protection there going forward.
I made three mistakes so far, each time it was because I opened the wrong port on the firewall, like 8092 instead of 8029, the good news is, you can’t get fired from here, so just enjoy the experience and stay positive. And as l learned in my day job, be careful what buttons you press!
@Inderpreet I thought it can be return to pending, you can see from the record, the duration of starting the task was less than 10 mins.