1. Connect to Facebook
If you have Facebook friends who play KoT, you can all connect your game profiles to Facebook to see each other in Retrieve Logs.

2. Join guild
Guildmates can also help each other. To join a guild, tap "Attack" button in your dungeon, then on league icon under "Find a match" and then find the guild you would like to join by using a search function or manually searching in Top Guilds and Friends sections.