OK, that’s fine. Perhaps the “Default Collection” counts towards the 2-collection maximum. If desired, you could look into whether it is possible to rename the “Default Collection” (to “Shared”).
Regardless, let’s start organizing some of your vault items. Go to the Admin Console in the Web Vault, then use the Filters in the Admin Console to open the “Default Collection” (or “Shared” if you were able to rename it). According to the information you’ve provided previously, this collection currently contains all of your financial account credentials, and you should see a list of these on the right.
Now, click the checkbox labeled “All” (to the left of the column title “Name”), which should put a check mark 
in front of every item. Having done this, click the kebab icon (three vertical dots) to the right of the column title “Permissions” and select Assign to Collections from the popup menu, as shown in the screenshot below:
You should then be presented with a dropdown menu, where you can choose the collection that you wish to assign the vault items to; choose the “Finance” collection only, and then click Assign.
After you’ve done this, verify that the “Finance” collection now contains all of your financial account credentials, and that the collection named “Default Collection” (or possibly named “Shared”, in case you were able to rename it) is empty.
Check back in, and I will provide additional instructions.