Assigning a member a role in future agenda

I have an administrator access for my club website as the VP of PR.

I can edit the next meeting agenda, but can not do a September meeting to assign a member in the club website.
I read the following link, but it could not help me.

support.toastmastersclubs.org/doc/item/editing-an-agenda

1) Without your club number there is nothing we can do for you.
2) When talking about agenda we need the date of the agenda.
3) When talking about a member we need at least a first name.

Thank you for your comments, Brian.
1) Our club number is 1362687
2) The date of agenda is 13 September 2021
3) My first name is Iwao
I am not an administrator of the club website, but do I have to ask an administrator to grant my personal ID as the VP of PR to edit future agendas? I can only edit the next meeting agenda, 23 August 2021.

1) Only the Site Admin, Toastmaster of the day and VPEd automatically have Agenda Update.
2) When the VPEd creates the agenda template and defines the roles they can designate a role as having Agenda update.