Recharging emblems in Fire Emblem Engage is a simple process. First, make sure that you have enough bond level and bond fragments. This will unlock more spirit and unit slots to equip the emblems, as well as unlocking more skills and weapons to use.
Once you have enough bond level and fragments, select the ring you wish to recharge and then select the "Recharge Emblems" option. This will cause the ring to be filled with energy, and once it is full the emblems will be recharged. Be sure to equip the emblems you wish to recharge before doing so, as this can affect their effectiveness in battle.
Swapping and recharging emblems in Fire Emblem Engage is a great way to customize your experience and turn the tide in battle. With the right combination of emblems and the ability to recharge them, you can make sure that your unit is always at their best. So, get out there and choose to engage!