Drop Down Menu Button not available

Site URL: https://trombone-disc-lhma.squarespace.com/config/

I am helping someone configure her page before it goes live...
We're still in the building stage.
I've noticed her Home Page menu is way too cluttered.
I've seen how easy it is to use the Pages location to create folders for dropdown menu.
When I open the pages folder... the plus sign on the top right of the pages window (Main Navigation) will not display the plus sign to add a folder.
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I have no idea what plan she is using.
Is there a limitation on the use of dropdown menus by the plan purchased OR perhaps the use of page templates?
I'm familiar with other basic items of entry and manipulation... but this one has me stumped.
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IF the use of templates limits the use of dropdowns ... will it also restrict the replacement of images and backgrounds as well?
It also appears I cannot replace any template images.
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Thanks for any assistance.
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Until that time...

2 hours ago, Earl_J_MauiBoy said:

When I open the pages folder... the plus sign on the top right of the pages window (Main Navigation) will not display the plus sign to add a folder.

This usually occurs when you have been provided with non-administrator account, as only Administrators and Site Owners can create pages and folders, and change banner images. It is not usually a payment plan issue. Ask the person who created your account to change your permissions to Administrator. They can do this in Settings > Permissions. 

Thanks Paul,
She indicated that I was... I can do most all things...
It's just that pesky "+" that won't appear... (grin)
I'll let her know and see what happens.
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Thank you for the quick response.
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Until that time...