adding different title for a single form in rails

I have a Task management applciation where users can add task and edit
it. I am using single form for it. When I render this form for edit and
new, I need to assign the different form title for each. Say "Edit task"
and "Assign new task". How do I implement it. I am new to rails. Please

simple_form does that

You can set the title in the controller methods, or you can set it in a
view helper based on the request path.