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 the "Attack" button in your dungeon, then tap the league icon under "Find a match" and then find the guild you want to join by using the search function or by manually searching in the Top Guilds and Friends sections.