Use the WhatsApp button, (preferred) text or email with as many details as possible about your requirements. 

for example.

Handling sessions: please provide the hosting location, if not ours. Number and rough ages of handlers attending. Dates and time wanted.

Boarding services: Species, sizes, medical issues, dates required.

Rescue and rehoming: Species, sizes, ages, is vivarium being donated, any medical issues.

Adoption: species, experience, please attach photos if you have an enclosure already.