I have a form on a concrete5 site, I want to change the email address on the form, but it will not let me change the address. Any help please

Server info
# concrete5 Version
5.6.0.2

# concrete5 Packages
Designer Content (3.1), Simple Image Gallery (1.1.2).

# concrete5 Overrides
blocks/retailers.zip, blocks/form, blocks/banner_one, blocks/page_list, blocks/product, blocks/autonav, blocks/retailers, blocks/bob, blocks/enquiry, themes/hi-tech-plastics, themes/hi-tech-plastics.zip

# Server Software
Apache

# Server API
cgi-fcgi

# PHP Version
5.3.23

# PHP Extensions
bcmath, calendar, cgi-fcgi, Core, ctype, curl, date, dom, ereg, filter, ftp, gd, gettext, hash, iconv, imap, intl, ionCube Loader, json, libxml, mbstring, mcrypt, mysql, mysqli, openssl, pcre, PDO, pdo_mysql, pdo_sqlite, Phar, posix, Reflection, session, SimpleXML, soap, sockets, SPL, SQLite, sqlite3, standard, suhosin, timezonedb, tokenizer, xml, xmlreader, xmlrpc, xmlwriter, Zend Guard Loader, zip, zlib.

# PHP Settings
max_execution_time - 600
log_errors_max_len - 1024
max_file_uploads - 20
max_input_nesting_level - 64
max_input_time - 60
max_input_vars - 1000
memory_limit - 1024M
post_max_size - 1024M
safe_mode - Off
safe_mode_exec_dir - /usr/local/php/bin
safe_mode_gid - Off
safe_mode_include_dir - <i>no value</i>
sql.safe_mode - Off
upload_max_filesize - 500M
mysql.max_links - Unlimited
mysql.max_persistent - Unlimited
mysqli.max_links - Unlimited
mysqli.max_persistent - Unlimited
pcre.backtrack_limit - 1000000
pcre.recursion_limit - 100000
session.cache_limiter - nocache
session.gc_maxlifetime - 7200
soap.wsdl_cache_limit - 5
safe_mode_allowed_env_vars - PHP_
safe_mode_protected_env_vars - LD_LIBRARY_PATH
suhosin.cookie.max_array_depth - 50
suhosin.cookie.max_array_index_length - 64
suhosin.cookie.max_name_length - 64
suhosin.cookie.max_totalname_length - 256
suhosin.cookie.max_value_length - 10000
suhosin.cookie.max_vars - 100
suhosin.executor.include.max_traversal - 0
suhosin.executor.max_depth - 0
suhosin.get.max_array_depth - 50
suhosin.get.max_array_index_length - 64
suhosin.get.max_name_length - 64
suhosin.get.max_totalname_length - 256
suhosin.get.max_value_length - 1024
suhosin.get.max_vars - 100
suhosin.log.phpscript.is_safe - Off
suhosin.memory_limit - 0
suhosin.post.max_array_depth - 50
suhosin.post.max_array_index_length - 64
suhosin.post.max_name_length - 64
suhosin.post.max_totalname_length - 256
suhosin.post.max_value_length - 1000000
suhosin.post.max_vars - 1000
suhosin.request.max_array_depth - 50
suhosin.request.max_array_index_length - 64
suhosin.request.max_totalname_length - 256
suhosin.request.max_value_length - 1000000
suhosin.request.max_varname_length - 64
suhosin.request.max_vars - 1000
suhosin.session.max_id_length - 128
suhosin.upload.max_uploads - 25