Step 2:
Once you have registered your personal profile (it's a good idea to complete your profile - upload a profile photo and give some information about who you are), you must then create a group. To create a group go here
Step 3:
Once you have a group created (also a good idea to upload a group photo and add some details of the group - what the group is and what it's about), you can then create a need. From your group page, click on the create need link under "group tools"