If you connect in management Studio to the Analysis Services instance with a user id that has administrative rights on this Analysis Services instance, then you can right-click the instance node, and select Properties/Security to see the users having instance administration rights. Check these and possibly add your account to them.
Also make sure when trying to deploy a project from BIDS that you deploy to the correct server: Right-click the project instance, select Properties/Deployment to check and change these settings.