postgresql to mssql

Dear Support Team,
We found your contract information before my previous contract email and
postgresql website. Because now we prepare change database from mssql to
postgresql, and we use aspnet to develop website. Would it be possible to
help us guidance about how to change connection setting in web.config file
as listed as below:

<appSettings>
<add key="CconString"
value="Server='10.10.10.67';uid='sa';pwd='5342601water';database='DB14017'"/>
<add key="VBconString"
value="Server=10.10.10.67;uid=sa;pwd=5342601water;database=DB14017"/>
<add key="SMTPServer" value="mail.showstar.com.tw"/>
<add key="SMTPSend" value="zenki(at)showstar(dot)com(dot)tw"/>
<add key="SystemName" value="SmartAdmin"/>
<add key="AbsPath" value="/"/>
<add key="TrackSaveTime" value="/3/"/>
<add key="EditUploadPath"
value="\\nas2\webhost\17\14017\upfiles\EditUpload\"/>
<add key="UploadPath" value="\\nas2\webhost\17\14017\upfiles\ADUpload\"/>
<add key="CopyRight" value="http://www.creatop.com.tw/"/>
<add key="sKey" value="qJzGZDVJeCnFPGuxzaiB7NLQM3"/>
<add key="sIV" value="qcDPLw="/>
<add key="MainWeb" value="http://www.showstar.com/"/>
</appSettings>

Thanks a lot.
Best Regards, Anderson Hsu