Oscillator connection
Using Solder Bridges SB1, SB2, SB3 you can select the configuration:

Use external clock (Ext_CLK):

SB1 = closed, SB2 = open, SB3 = closed (my guess, check the IC's datasheet).

Use crystal for oscillator:

SB1 = open, SB2 = closed, SB3 = open

The capacitors C1 and C2 are load capacitors they are needed to make the crystal oscillator work. Their value should be mentioned in the datasheet of the crystal X2.

If no load capacitor value is given start with C1 = C2 = 10 pF and see if that works.