Before you send your application form to the Embassy, you must have it witnessed by an appropriate person.
The witness must be from one of the following professions only
The witness must wither know you personally or know a third party who knows you personally.
The witness also
Fully complete Section E of your application form - 'Certificate of Identity'
Sign your two passport-sized photographs (if under 18, parent must also sign the photographs)
Witness you signing Section E of your application form
Indicate on the form specifically whether they personally know you, or otherwise that you have been identified by a third party known to them.
Provide a business/work address and contact number. Private addresses for witnesses are not accepted.
Remember...
If your application has not been properly witnessed, it will be returned to you.