Prototyping is the 4th step of the design thinking process.Before you determine how you should go about the prototyping process, you have to have identified the users, defined their problem, and brainstormed and selected a proper solution in the form of a product or service.
Listed below are the steps in the prototyping methodology:

• Identify Obstacles .Start by brainstorming with your team to identify any obstacles that may delay or block your prototyping or product designing process. Having these identified prior to designing will allow you to take precautions.
• Select the Features.You prototype won’t be able to represent all the product features, therefore you might want to select the key features that will help you gather as much feedback from the user as possible.
• Sketch Your Design .You can do this on a piece of paper or a diagramming tool like Creately which provides complete libraries for wireframes, UI mockups, flowcharts, mind maps etc.
• Share Your Design .Share your design with partners, stakeholders etc. Ask for their feedback and mark where you need to make modifications to the design based on their requirements.
• Continue to Develop .Apply changes and develop your prototype by adding more features. Once it’s ready, you can share it with your stakeholders, partners, users etc. again for their feedback.