code: public void checkCheckboxInCell(int row, int column) {
          String checkboxLocator = getXPathBase() + "tr[" + row + "]/td[" + column + "]/input";
          CheckBox cb = new CheckBox(checkboxLocator);
          cb.check();
      }
docs: Tick the checkbox in a cell of a table indicated by input row and column indices
  
  @param row
  int number of row for cell
  @param column
  int number of column for cell