htaccess file

I am trying to update an .htaccess file with the following code:

#BEGIN Image Upload HTTP Error Fix
<IfModule mod_security.c>
<Files async-upload.php>
SecFilterEngine Off
SecFilterScanPOST Off
</Files>
</IfModule>
<IfModule security_module>
<Files async-upload.php>
SecFilterEngine Off
SecFilterScanPOST Off
</Files>
</IfModule>
<IfModule security2_module>
<Files async-upload.php>
SecFilterEngine Off
SecFilterScanPOST Off
</Files>
</IfModule>
#END Image Upload HTTP Error Fix

it currently has the following:

# -FrontPage-

IndexIgnore .htaccess */.??* *~ *# */HEADER* */README* */_vti*

<Limit GET POST>
order deny,allow
deny from all
allow from all
</Limit>
<Limit PUT DELETE>
order deny,allow
deny from all
</Limit>
AuthName debloemist.co.uk
AuthUserFile /usr/local/psa/home/vhosts/debloemist.co.uk/httpdocs/_vti_pvt/service.pwd
AuthGroupFile /usr/local/psa/home/vhosts/debloemist.co.uk/httpdocs/_vti_pvt/service.grp

How does one combine the two of them?