Your pitch will remain private on Crowdcube until you reach a certain investment milestone; this amount will be agreed between yourself and your Campaign Manager. This will give you enough time to secure your lead investment, as well as giving your own network of customers, family, friends and business contacts exclusive access to your pitch.
Once you've raised a solid chunk of your target, your pitch will be made public to Crowdcube's investor community. In order to maximise the success of your crowdfunding raise, you should continue to promote your pitch to your own network for the duration of your time on Crowdcube.
You can find guidance on how to get your pitch off to a good start, here.