Add "View this tweet" menu to your twicca.

So, you can view the tweet with browser or other twitter clients.
Or, you can view twitter with twicca.

( Below is for "Twicca supporters" only )
Twicca supports multi-acount, but not supports retweet from other acount.
You can do that by using this plugin.
Tap the desired tweet -> View this tweet -> Twicca .
Now, you can change your account to retweet. (Simply change acount with right-up button.)

*Check "Always" to always open a tweet with the app.
To cancel it, Do "Clear Data" in application information. .