Go to your browser's add-ons page/window, open the preferences for Rikaisama, then click the "Clipboard & Save" tab.
There will be a field labelled "Saved audio". You need to point this to Anki's collections.media folder if you want audio to work.
Now go to the Anki tab. There are two important fields here: "Save format" and "Field names". In the "Save format" field, you need to tell Rikaisama what information you want it to save. Here is an example:>$d$t$r$t$n$t[sound:$a]
The above tells Rikaisama to save the dictionary form of the word you've hovered over (this means conjugations will be stripped from it, so 食べます would be saved as 食べる), the reading (hiragana characters showing pronunciation of the word), the English definition of the word, and the audio clip (if one is available).
Now for the "Field names" field. You enter into here the names of the fields in your Anki deck separated by spaces like so:>Vocab Reading Definition Audio
You need to make sure these fields exist in your Anki deck.
Two more things.
1. You must install the Rikaisama add-on for Anki.
2. You must have open the deck that you want to save the word to (see pic)