Re: login with password
access web apps are being discontinued (think service ends March 2018) so there is no point in using it, it is only still running to give developers time to build a replacement app.
Powerapps are generally considered to be a poor replacement - google to find out more.
if this is for customers then presumably you expect them to connect via a browser and not have a client based app (such as access) on their machines. If so, then suggest you need to be looking at using visual studio/sql azure to create a web based app. There are plenty of other options, you mention wordpress but no idea if that will meet your needs, there is also development environments such as netbeans and eclipse.
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