On your Dashboard, if you have been added to an expenses group, you will see Expenses listed on Workspace.
To view your expenses or add a new one, tap on Workspace, then tap on the Expenses tile.
Here you see your expenses, which will either be marked as:
You can select which year you want to look at as well as filter which status of expenses you want to view e.g. if you only want to see expenses that have been paid.
You can submit a new expense from this page by tapping ➕ on the top right.