Reto currently has 7 seed nodes online, out of 10 known nodes, with an average of about 50 peers online concurrently. The latency on the network is higher than other networks and has an total uptime of 99% since it's inception. We found this network on Github as a fork, and some of the contributers are Boldsuck and M. The code divergence from from the orignally forked Haveno is moderate and is pending assesment for malware. Based on the network activity, the risk in loss of value engaging with the network is categorised as low. It's important you based your decision on whether to use this network base on your own assement of the metrics. None
You can connect by first downloading haveno to your desktop then once it asks for the seednodes, simply enter 2 of the nodes that are listed online from above, or you can click the connect button located at the top right of this page which uses the haveno:// scheme.
Yes, you can but they'll have seperate balances.