@sanatisharif sent you the instructions email, i am going to paste it here as well for others
For all the newusers I am going to make the assumptions of their JoinDate based on their first thread or comment;
@sanatisharif since your importing to an existing nodebb database
BEFORE you test it make sure make a copy of your original NodeBB database, setup a TEST NodeBB instance, and test with that before you do on your production database
After you have that done, here are the import instructions, I am going to assume that you are using a Linux based system, or mac
# go to the NodeBB directory you have
cd /path/to/your/NodeBB
# delete any previous import plugin you have, then a install the latest one, it was ONLY tested against NodeBB 1.0.0, but if you are running 0.9.x it should also work for you.
rm -rf node_modules/nodebb-plugin-import
cd node_modules
git pull https://github.com/akhoury/nodebb-plugin-import.git
cd nodebb-plugin-import
npm install
# then go back up a directory and install the disqus plugin, since it's not published to npm yet, you need to do it manually
cd ..
git pull https://github.com/akhoury/nodebb-plugin-import-disqus.git
cd nodebb-plugin-import-disqus
npm install
# here you need to paste your disqus XML exported dump file somewhere, let's paste it here, you dont have to do that, part
cp /path/to/my-file.xml .
# now go back up to run nodebb
cd ../..
# run NodeBB
node app
Now you visit your nodebb, say it's http://localhost:4567
Go to Admin Control Panel > Plugins > and activate Import plugin
then restart your nodebb
then back to http://localhost:4567/admin/plugins/import
Click on "Toggle pre-import settings"
Then in the "Exporter specific configs (if applicable)" write a valid JSON that has the full path of the XML file, for example: {"filepath":"/Users/akhoury/code/NodeBB/node_modules/nodebb-plugin-import-disqus/my-file.xml"}
See this picture: https://cloud.githubusercontent.com/assets/1398375/14342545/5e5ccef2-fc68-11e5-84d0-a42e1acb0cbd.png
Then, scroll down to the "Select an Exporter" section
and enter the box "nodebb-plugin-import-disqus" and make sure you check the "Skip the module install" checkbox
see this picture: https://cloud.githubusercontent.com/assets/1398375/14342546/5e630de4-fc68-11e5-8e1a-ba736f528759.png
Then Scroll down, and, for your case since you already have topics in the NodeBB database, you need to click on the green button "Don't Flush NodeBB DB, just import"
see this picture: https://cloud.githubusercontent.com/assets/1398375/14404948/0ee7a10e-fe51-11e5-80d1-2d7a58931769.png
Then when it's done, click on "Toggle post-import tools"
In the "Content conversion" section, select "HTML to Markdown" then click Convert
then restart your NodeBB again and check the results by reading the topics to see if everything looks good.