Adding Username/Password Persistence To A IOS WebView Template

I'm not too good with this at all, so here goes. I purchased the WebViewPlus IOS Template from Code Canyon. I want to add a feature so the Users user and pass saves when the app is force closed. The website is http://ift.tt/2iDPqlQ. I also have another template, IOS Webview With Scrollable Tabs by DMB Team. I could use either one. Let me know if I need to submit anything.