Change the strings one after the other to avoid lost of tension at the top side of the guitar.
Start with the first string. Rasp the top of the string a little bit and guide it through the bridge and swathe it 4 times on itself. After that, guide the other top of string through the tuners and swathe it 3 times on itself. Tense (tight) the string with the hand and start tuning the string with the tuners.
With the second string, rasp it too and turn it 4 times on the bridge and 2 times on the tuners.
With the third string, rasp it too and turn it 3 times on the bridge and 2 times on the tuners.
The fourth, fifth and sixth string, turn it 1 time on the bridge and 1 time on the tuners.
It's important to tense the strings with the hand before your tune it with the tuners. Thus, they will be stretched and less out of tune.