A couple of changes that you can make to your event need to be confirmed and edited in your original application first before they can apply to your event, as you won't be able to edit them at the 'Edit Event' stage. One of these is the venue of your sessions.
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Changing Or Adding Additional Venues In The Application
Venue changes must be approved by your County FA, so you need to re-visit your original, approved application first. Go to the 'Applications' tab and then choose the application that you need to change or add a venue for.
Use the pencil icons down the right side to edit the venue section of the application. This should take you straight to the venue part of your application again where you can add, change or remove a venue.
To add a venue in the application, simply press the 'Add New Venue' button as demonstrated below and fill out the details. To replace the existing venue, just type the new venue name in the search box, hit 'Find Venue', and then choose from the list below. Save the change and re-submit the application back to your County FA to look over and re-approve.
Editing Venues In The Event
When your venue change or venue addition has been re-approved by your County FA (the same one to whom you made the initial application), the approved venue(s) will appear in the drop-down list when you create your event. You can then choose which venue you would like to use for the sessions you are about to create.
If you add a new venue on top of your original venue in your approved application so that you now have two (or more) venues to choose from, the new venue will be able to be selected and used for any upcoming sessions you have.
If you wish to use the new other venue on sessions that were already listed in your 'Current Sessions' tab before you made the change, you will need to individually press onto each session and click 'Edit Session' to swap the venue over for that specific session.
Once pressed, you would then have to use the pencil icons down the right side to edit the venue section and then choose the appropriate venue for that one session.
Upon clicking the pencil icon, you will see that you have as many approved venues as shown in your application to choose from for this particular session, and you can select the right one by simply clicking it. Save the change and then your venue for that session is confirmed! You can repeat as necessary per individual session if you are constantly needing to chop and change venues throughout your event.
Please note that if you need to edit your venue for multiple sessions and not just one individual session, you can instead use the mass-update filter tool to do more than one at a time. Please see the article on that separately.