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Thank you. I'll try this.

Any questions you may have, feel free to ask.

HHDev can't recognize my Keychain. I can't log in

In your keychain do you have all the keys there? You've imported it correctly menu > accounts > manage accounts, there you set your active, memo and posting key. Take a look and let me know if it worked. Then post a screenshot of the error on the hhdev page, please.

I'm currently using the keychain swap itself. HHDev is too complicated for me

I see, if you can do it via keychain, that's good too, I think their app is very reliable! I hope everything works out for you.