Hold the bridge in one hand and tighten the strings in the reverse order you loosened them. That is, tighten the A-string and D-string first, and then, tighten the E-string and G-string. Tighten until each string matches its rough standard pitch (violin tuner suggested).

Continue to adjust the bridge to keep it perpendicular to the violin body every time you tighten the string so it is not leaning too far away from the f-holes.

After tightening all four strings, play a little to test the string placement. If the distance between the strings is not comfortable for performance (as noted in step 4), repeat step 2-6 and adjust the distance between the strings on the bridge again to find the proper distance.