Recently, this forum has been increasingly used to ask questions about how to use ZBrush. That is not what this forum was meant for, this forum is ONLY meant for sharing completed tutorials.
If you have a question about how to use ZBrush, please post it in the Questions & Troubleshooting Forum instead. Not only will this make it easier for us to find and answer your question, but it will make it possible for people to search the tutorial forum and find actual tutorials about specific ZBrush features, rather than a bunch of random questions with answers that are less detailed than a full tutorial might be.
Thank you for your cooperation! Happy ZBrushing!