From time to time you may add an expense which is later deemed not to be allowable or was simply added as a mistake, this is nothing to worry about and the expense can be deleted by following these steps:

First you will need to go in to the expenses tab:

Once in the tab locate the expense you wish to delete from the list:

Click into the expense, this should lead you to the page where you are able to edit the expense. You can then simply click the delete expense button at the bottom:

Once you click this the app will direct you back to the expenses tab where you should find that the expense is deleted:

If you still can't delete your expense after trying the above, please reach out to support.