Answer:
Saving dolphins is not a difficult task; it only requires some attention and dedication from all of us.
One of the most important issues that could help to save dolphins is reducing the pollution in the oceans which cause thousands of dolphin deaths every year.
The second problem to address is bycatch which is probably the primary cause of mortality among dolphins. Some fishing nets, like gillnets, trawls and those deployed by tuna ships kill dolphins unintentionally but in high number.
Also, sound pollution seems to disrupt dolphin behavior and could be the cause of the large strandings that we sometimes witness.
Finally, stopping of all kind of commercial killing is a must.
If these actions are not in your hands, diffusing information about the problematic and educating people about dolphins is the best way you can help to save dolphins.