In order to use Builds.io smoothly, you need to make sure that the Private Browsing mode is disabled.
You can watch our step by step tutorial here.
If you don't want to watch the video use the instruction below
On an iPhone, iPad, or iPod touch, open Safari, then tap . Tap Private to turn private browsing off.
If you're using iOS 7 or earlier on an iPad, open Safari, tap to open a new tab, then tap Private.