There are many different forms for the imperative in Spanish using the indicative and subjunctive moods and for informal and formal forms.
Informal
The 'tú' form'
Simply take away the 's' from the ending of the tú form in the present tense
Hablar - hablas - habla
Comer - comes - come
Abrir - abres - abre
The 'vosotros' form
Simply take away the 'r' from the infinitive and add a 'd'
Hablar - hablad
Comer - comed
Abrir - abrid
Formal
For 'usted' and 'ustedes' use the present subjunctive
Hablar - hable - hablen
Comer - coma - coman
Abrir - abra - abran
Therefore for the verb hablar you have:
Hablar
tu habla
usted hable
vosotros hablad
ustedes hablen
There are irregular verbs for the imperative!