Simple,
first equalize the denominators (thats the bottom number)
Both of them can be turned into 12.
for 2/6, to change 6 into 12, you multiply it by two. To keep the expression equal, you multiply the top number by 2 as well. So the first number is 4/12.
The second number, 4 has to be multiplied by 3 to get 12. multiply the top of the number by the same number. The second number becomes 6/12.
Rewrite the question:
4/12 + 6/12. Just add the top numbers.
Your answer is 10/12.
Hope this helps!