Create a file named ethereumdark.conf in your ethereumdark wallet folder (most likely ~/.ethereumdark) and add the following to the file:
addnode=5.9.69.5:21001
addnode=178.49.192.210:21001
addnode=96.233.137.21:21001
addnode=81.217.87.244:21001
addnode=101.191.6.196:21001
addnode=89.212.142.123:21001
addnode=73.241.206.73:21001
addnode=81.143.239.183:21001
addnode=75.136.57.13:21001
Then save it and (re)start your wallet.
here is the node list I got from coinexchange.
addnode=188.191.236.78
addnode=178.41.25.133
addnode=96.55.106.174
addnode=54.246.246.71
addnode=95.208.248.186
addnode=49.151.18.20
addnode=91.21.69.130
addnode=54.193.1.150
addnode=110.139.168.75
addnode=89.152.239.137
addnode=99.12.70.177
addnode=81.143.239.183
addnode=66.229.237.53
addnode=98.196.40.170
addnode=121.45.153.249
addnode=87.144.245.179
addnode=86.89.72.225
addnode=73.241.206.73
addnode=104.11.106.137
addnode=94.141.162.45
addnode=178.49.192.210
addnode=175.156.139.50
addnode=85.76.55.120
addnode=99.192.111.42
addnode=101.191.6.196
addnode=75.128.183.25
addnode=89.212.142.123
addnode=79.168.204.179
addnode=81.217.87.244
addnode=81.17.149.213
addnode=70.105.233.61
addnode=5.167.79.45
addnode=96.233.137.21
addnode=37.97.242.80
addnode=74.118.192.18
addnode=108.173.143.48
addnode=75.136.57.13
addnode=146.52.131.72
addnode=118.10.154.160
addnode=98.251.88.195
addnode=178.71.6.70
addnode=75.167.44.12
addnode=98.196.40.170
addnode=13.59.134.17
addnode=104.204.108.209
addnode=105.103.31.171
addnode=176.193.87.85
addnode=123.201.121.66
addnode=92.44.29.52
addnode=212.24.176.188
addnode=95.221.68.14
addnode=88.244.231.47
addnode=93.115.61.74
addnode=87.115.192.251
addnode=108.172.41.139
addnode=108.172.41.139
addnode=108.172.41.139
addnode=108.172.41.139
addnode=54.154.195.11
addnode=67.164.172.103
addnode=87.117.189.39
addnode=68.151.217.7
addnode=218.110.155.106
addnode=77.121.108.134
addnode=37.144.94.137
addnode=95.91.247.57
addnode=95.88.221.27
addnode=93.140.126.176
addnode=74.209.45.199
addnode=89.106.1.126
addnode=109.129.204.84
addnode=212.112.97.169
addnode=78.102.76.31
addnode=68.255.78.137
addnode=183.9.117.164
addnode=110.37.226.122
addnode=217.224.55.143
addnode=114.109.132.36
addnode=72.35.115.241
addnode=108.172.41.139
addnode=49.147.96.80
addnode=37.228.244.216
addnode=180.190.181.17
addnode=168.70.96.212
addnode=34.210.4.135
addnode=174.64.15.57
addnode=87.115.192.251
addnode=212.95.8.178
addnode=41.114.32.193
addnode=77.127.54.111
addnode=18.221.148.196
addnode=49.151.153.67
addnode=108.172.41.139
addnode=86.87.89.145
addnode=104.162.206.79
addnode=108.77.80.39
addnode=98.238.231.111
addnode=14.192.212.127
addnode=45.32.77.169
addnode=110.54.178.189
addnode=110.54.183.24
addnode=27.253.50.0
addnode=188.22.210.102