OK, back on topic . . .
This circuit is for plain perfboard (shown) or single-pad PCBs -- boards with multi-pad traces will not work unless you cut the traces.
The diagram is a side view that uses one wire (red) to daisy chain the diodes in parallel.

Solder the daisy chain to the diode lead as close to the board as possible. (like the left side wire)

Use wire strippers and slide the insulation to create gaps for soldering then push the insulation back to protect the traces from shorting.

The diagram shows a side view (pins 2, 4, 6, etc.) with the diodes leads bent so that they fit into the 3rd and 5th holes from the previous connector.
For the diodes on the next trace (pins 3, 5, 7, etc.), bend the leads so they fit into the 2nd and 5th holes from the previous connector.
You may need more space between connectors/solder points so the diodes for pin 2 go from 5th to the 7th hole and the diodes for pin 3 go from the 3rd to the 7th hole. (one more space between connectors than in the picture, two more than the diagram)
Alternating diode length from one daisy chained line to the next gives you more room to work and decreases the chances of shorting.

Top view shows diodes installed for pins 2 and 3.
Scott