No Admin Access /Cannot change existing user accounts to admin account

Hello All,
I'm delighted to have found you and after a long day of trying to help myself i am now requiring your much appreciated assistance please! I'm not a techy person at all and am hoping someone can help:)
Last week my husband purchased a new hp laptop which came with Windows 10
On setup i used my microsoft account to login with a pin, the account was setup as administrator (thinking i could change things later)
About 2 days later i added a standard user account for my husband with a microsoft account login with pin.
I wanted to make his the administrator account but thought i had better change mine to a standard account first! My mistake!!
Now i cannot change anything! i have tried to use the cmd prompt to run as administrator - it asks for administrator permission and does not allow me to enter a password or yes!
I have tried all suggestions to enable the hidden windows 10 account but all ask for the same permission.
I have tried to go to setup, recovery, troubleshoot, advanced option, system restore - it requests an administrator password and when i entered what i thought is mine it does not work! Feeling a little
Does anybody know anyway i can go back in time to start again or how do i access administrator rights as i really need to add programs etc
Thank you for any help given

Here is a guide to activate the built-in admin account. You need option 4.

Administrator account - Enable or Disable in Windows 10 - Windows 10 Forums

Once that is completely, then you can give you or your husband admin rights.