© 2019 IEEE. This paper describes a design for peer learning activities using a discussion forum in a learning management system (LMS) after a face-to-face workshop in blended learning environments. The purpose of this program is to share expertise in instructional design (ID) theory and allow participants to master the basic skills of ID. The blended program consists of face-to-face workshops and pre-and post-workshop e-learning assignments. Those who meet the criteria and pass assignments are issued a digital badge as a certificate of completion. The peer learning design on the discussion forum in post-learning phases was supported by the four principles of knowledge sharing, adaptation to proficiency level, reflection as main topic, and group structure and engagement. The targets of this study were novices of the learning contents and were unfamiliar with online learning. Based on these conditions, the peer learning activity was rather simple, which was deemed suitable for this group. Based on participant reactions, it is suggested that the design strategy behind peer learning in this study encourages participants' mastery of content. Further, some participants reported positive reactions toward peer learning in the discussion forum of the LMS utilized in this program.