I found the way you can install your own dictionary. You can follow this thread
https://www.mobileread.com/forums/sh...13&postcount=5
I didn't install the stardict, I just downloaded some dicts from
http://download.huzheng.org/dict.org/ and unpacked them and moved them to "Internal storage\Dict" . Feel free to delete those original files located in "Internal storage\Dict" since they are just English to Chinese dicts.
PS. Make sure you back up those files before you delete them. You may need them in future just in case.