England to San Francisco immigration

[skurrie]

l was hoping someone can help me out with this query.
 
John Henry Stephens and Mary (nee' Trevena) Stephens . Could be Stevens.
Immigrated to the US from England.(Unsure of what port in England they sailed from, but they were both born in Cornwall).
 
l have found the following, and was wondering if anyone could access or direct me to how l can get any further information.
John and Mary arrived in San Francisco in 1862. Published Code 7156 page 66 in the US Immigration records.

The same Stephens plus their 5 children then returned to England between 1873 and 1877. Any help with shipping here would also be appreciated.
l thank you in advance for any help you can provide.
Skurrie