How do you say agregar mas datos in English?

The best translation for "agregar más datos" in English depends on the context. Here are some options:

General:

* Add more data

* Include more data

* Provide more data

* Supplement with more data

Specific contexts:

* For data analysis:

* Append more data

* Augment the dataset

* Expand the data set

* For a data entry form:

* Enter more data

* Fill in the remaining data fields

* Complete the data entry

Informal:

* Add more stuff (This is more casual and may not be appropriate in all situations)

The best translation will depend on the specific situation and the intended audience.