Step 1: From the tasks list, click on the (+) button
Step 2: Select if your task requires a form to be filled
Step 3: Select your optional form (1), then tap on Next (2)
Note: On iOS, the next button is located on the top navigation bar.
Step 4: Fill the task details an tap on Next or Save
Step 5: (Optional) Fill additional fields, specific to the selected form on step 1 and tap on Save