Web developer to replace a password

I have a e-commerce Website in WorldPress. There is also created a database linked on in order to handle external Associates (/Private.. for Associates) and (/admin for admin functions). Languages used are php5, javascript and sql and the table type is InnoDb.
By mistake I have cancelled from WP my membership as administrator and I have lost access to /admin ..so I cannot control Associates’ roles etc. I do have acces on server and WP dashboard. The developer is not physically able to help and I need somebody experienced to replace function. For the right person there is more work in the near future.
Thanks
Costas