@vintagepornbay – the BP peeps around here really want people to add big text like “NSFW” – “ADULT SITE” – when posting in regards to such things when they include links to check out things.
I guess you are talking about the login / register in the very top admin bar disappearing at mobile media query?
I am sure there is info about the admin bar and missing at mobile with 2015 theme somewhere on the net – likely in the wp org forums.. or a plugin to override that.
Rather than spend time on that.. I would suggest that you add a register / login field in the sidebar widgets.. most regular people are not going to be attracted to the login register in tiny little text way off the screen.. in my experience, even posting an image tutorial showing people how to access the login and bp hover menu – they all preferred an actual on screen menu item in top nav bar, and in the login / register sidebar..
question for you – maybe it’s just the way it’s written, but your sidebar says “Secured by McAfee SiteAdvisor and Norton Safeweb.” perhaps you mean “Secure” – not “Secured” – unless you have those systems actually doing securing?
anyhow, I see now you have some login / register stuff in your sidebar as well, and when you get to smaller screen with the 2015 theme, the whole sidebar turns into a stupid hamburger menu.
Rather than post a long list of why 2015 was one of the worst decisions of.. well, let me suggest you switch to the 2014 theme and see how it’s bars act on various sizes.. it’s not an awesome theme, but I think it behaves better for most things, and may solve the issue in which you are describing.