* Adding problem to ToDo list: Go the problem page(spoj.com/problems/<problem_name>) and click on + ToDo! button.
* Removing problem from ToDo list: Go the problem page(spoj.com/problems/<problem_name>) and click on - ToDo! button.
* View ToDo list: Go to your profile page(spoj.com/myaccount/). There will be a list with heading User maintained TODO list containing your added problems with corresponding links.
