If you need to edit one table directly without using one SM30 view do these steps:

Go to SE16N;
Insert table name, press enter;
In transaction box on top write “&SAP_EDIT” and press enter;
Press F8 and insert line and delete line button will be available.

Please be very carefull when doing this, it may damage the entire system and create inconsistencies in the database causing, only use if you know what you are doing.