You need to have an account at https://www.webonary.org/.
You will be given a site name. It is usually the FieldWorks project name, but could be different.
See: https://www.webonary.org/host-your-dictionary-at-webonary-org/.
Prepare the dictionary and reversal indexes. This includes (not exhaustive):
Choose a publication in Publish <item> In fields to specify publishable lexical data.
Configure one or more dictionary layout. This can include using the Manage Dictionary Layouts dialog box.
Configure one or more reversal index layout.
This can include using the Manage Reversal Index Layouts dialog box.
In the Navigation pane, click Lexicon Edit, Browse or Dictionary.
On the File menu, click Upload to Webonary. Then, do the following:
In the Site name box, type your site name.
In the Username box, type your username.
In the Password box, type your Webonary password.
Click the Publication control down arrow and then click the publication.
Click the Layout down arrow and then click the desired layout.
The layouts you can click are only those that are available to the publication you chose in the previous step. Available layouts were set in the Manage Dictionary Layouts or Manage Reversal Index Layouts dialog boxes.
In the Reversals box, select () any of the reversal indexes that you want to include with the vernacular dictionary.
Click Submit to upload the dictionary and any reversal indexes.
Click View Report to open the Webonary Log dialog box.
You can click Full Log to see the entire upload history.
Click Rejected Files or Errors & Warning to only rows that show a problem.
You might want to get more help if you see problems.
Click Save Log to save a copy of the log to your computer.
Any *.wav files in your FLEx data are converted to *.mp3 when uploaded to Webonary.
You may notice an increased upload time if you have many *.wav files.
FieldWorks does not support *.tif. You need to convert them.
Supported file formats for Webonary exports include:
*.wav, *.jpg, *.jpeg, *.gif, *.png, *.mp3, *.mp4, and *.3gp.
These are supported by most web browsers, including the embedded Firefox browser that FLEx uses to display entries in Dictionary.
Manage Dictionary Layouts dialog box