In order to browse or edit data cells in Stata, the browse and edit commands are the most commonly used. The difference between those two commands is that browse merely offers a read-only version of the data. To try it out using the nlsw88 dataset, just type:
sysuse nlsw88, clear
browse
This will open the data editor displaying an overview of the sample data, much like you would get opening a spreadsheet in Excel for instance. To just look at specific variables add them as parameters to the browse command, like so:
browse age grade
And just these variables are displayed. Now in order to edit some of the cells, close the data editor and type:
edit
This again displays the data editor but with the option to actually edit data.