Thanks! it works now. Actually when i was activating the plug-in directly after installation, it gave an error warning, but it can be activated from WP’s plug-in page smoothly.
And probably, just a suggestion, you could give the language options on iframe setting by adding ‘hl=xx’ to Google Calendar’s link in iframe? I’m accessing my web in Korea, and by default, the calendar is in Korean, while most of the readers is using Indonesian and English.
Thank you!