micah.zoltu: it's just generic use of the config command which is `ipfs config --json <key> <value>` (if you need to set a complex pattern rather than a string then --json is your friend).

In this case you're looking at something like 
```
ipfs config --json Peering.Peers '[{\"ID\" : \"QmFoo\", \"Addrs\" : [\"/ip4/1.2.3.4/tcp/4001\"] }]'
```

Note: IIRC how strings are escaped on the CLI may be specific to your shell (I used powershell core in my example above)