From the Dashboard, select "Scheduling" followed by "As Participant".
Once here select "Self Scheduling".
On the right-hand side click the Calender Date you wish to work on. Once this is done you will see the 0/2 games under the "Unassigned Matches" section.
There are two options here. One is moving the game to the correct time in the current day (Red Arrow) Or moving it to another day (Blue Arrow)
*Note: Games must be in the "Unassigned matches" area before they can be moved to another day.
The Screenshot below is to show what the current day will look like if you did move the game to Mon. 2nd November.