Here's a quick step-by-step article on how to change your draft date/time using both the mobile and web app. 

Using the Mobile app:

Step 1:  On the home page, scroll down until you see the draft card. Below is a screenshot of what it should look like. 

Step 2: Tap the clock icon and the option to set a different time/date will pop-up. 

Step 3: Select your preferred date/time and tap "Confirm". 

Using the web app:

Step 1: Go to your league settings and select "Draft Time". 

Step 2: Click on the date to change the scheduled draft. To change the time, click on the clock and enter the desired time for your draft.